When is it okay to use an "overdone" song

<p>I would not use part of a song unless you are able to sing the whole song in that same key. I don’t remember for which school my D was auditioning in which they had her sing a different cut of her song than she had planned- I don’t remember if she sang her original cut and then they asked her to sing more or what the exact situation was- in any event, you should be prepared to sing any part of the songs you take with you.</p>

<p>C is the original key for This Nearly Was Mine.</p>